let html = document.querySelector('#html');
let style = document.querySelector('#style');
let string = `
/*
*你好，我是一名前端新人
*接下来我要演示一下我的前端功底
*首先我要准备一个div
*/
#div1{
    border: 1px solid red;
    width: 200px;
    height: 200px;
}
/*
*接下来我把div变成一个八卦图
*注意看好了
*首先，把div变成一个园
*/
#div1{
    border-radius: 50%;
    box-shadow: 0 0 3px rgba(0,0,0,0.5);
    border:none;
}
/*
*八卦是阴阳形成的
*一黑一白
*/
#div1{
    background: linear-gradient(90deg,rgba(255,255,255,1) 0%, rgba(255,255,255,1) 50%, rgba(0,0,0,1) 50%, rgba(0,0,0,1) 100%);
}
/*接下来加两个球*/
#div1::before{
    width:100px;
    height: 100px;
    top:0;
    left: 50%;
    transform: translateX(-50%);
    background: #000;
    border-radius: 50%;
    background: radial-gradient(circle,rgba(255,255,255,1) 0%, rgba(255,255,255,1) 25%, rgba(0,0,0,1) 25%, rgba(0,0,0,1) 100%);
}
#div1::after{
    width:100px;
    height: 100px;
    bottom:0;
    left: 50%;
    transform: translateX(-50%);
    background: #fff;
    border-radius: 50%;
    background: radial-gradient(circle,rgba(0,0,0,1) 0%, rgba(0,0,0,1)25%, rgba(255,255,255,1) 25%, rgba(255,255,255,1) 100%, rgba(0,0,0,1) 100%);
}
`;
let string2 = "";
let n = 0;

let step = () => {
    setTimeout(() => {
        if (string[n] === "\n") {
            string2 += "<br>";
        } else if (string[n] === " ") {
            string2 += "&nbsp"
        } else {
            string2 += string[n];
        }
        html.innerHTML = string2;
        style.innerHTML = string.substring(0, n);
        window.scrollTo(0, 999999);
        html.scrollTo(0, 999999);
        if (n < string.length - 1) {
            n += 1;
            step()
        }
    }, 50);
}
step();
